Oil pump



May 13, 1930. A. A. KAPLANsKY OIL PUMP Filed July 16, 1929 INVENToR ATTORNEY Patented May 13, 1930 UNITED STATES PATENT OFFICE ABBAM A. KAPLANSKY, F MOSCOW, UNION 0F SOVIET SOGIALIST REPUBLIGS i on. PUMP Application ined July 16, 192s, serial No.

My invention relates to oil well pumps and has a particular reference to pumps adapted to pump oil, water, brine etc. .from deep wells. Due to the limitation of the suction height,

the pumping mechanism in deep wells must be placed at the bottom of the well, bringing operating connections to the outside. Ordinary deep well pumps are provided with rigid rods extending from the mouth of the well where an operating engine or motor is located, to the bottom where the pump is placed.

This arrangement causes considerable dim-- culties when the depth of the well reaches a few thousand feet, due to the greatweight of from the pump, and the large amount of friction caused partly by the elastic distortion of the rod, partly by the unavoidable curvature of the Well itself. j

In order to obviate these diiculties I provide an auxiliary reci rocating device adapted to be operated by lille pressure of a liquid. Thisdevice is operatively connected with the pump and is also placed at the bottom of the well. A pipe extends from this device to the top of the well where another similar device is located for imparting a reciprocating movement to the liquid column in the pipe and thereby causing a reciprocating movement of the auxiliary device and of the pump.

With this arrangement there are no rods or cables passing through the well, so that a great saving in power is effected, with a very efficient control of the operation of the pump.

My invention is explained more Vfully in the accompanying specication and drawing in which- Fig. 1 is a sectional elellation of the well with its casing pipe and the"pump, Fig. 2 is a sectional elevation of the upper operating device, and Fig. 3 is an outside view of the apparatus showing well in section. l

My pump consists of a cylinder 1 adapted to be fitted at the bottom of a casing pipe 2. It has a flattened bottom portion with holes 3.

The holes may be covered with screens in order to prevent any sand or dirt from passing through the pump.

The cylinder 1 has a wall 4 in the middle with a ball valve 5 which admits liquid from the rod, its interference with the exhaust pipe 378,636, and in the Union of soviet socialist Republics May 24, 1929.

the well into the casing pipe above the valve. A piston 6 is slidably fitted in the cylinder 1 and is provided with a ball valve 7 adapted to admit the liquid into the space above the piston. A rod 8 extends from the piston and passes through an antifriction bushing 9 fitted in the lower end of a second or auxiliary cylinder 10 the outside diameter of which is smaller than the inside diameter of the casing pipe 2, so that liquid can pass in the clearance around this cylinder. A second or 'auxiliary piston 11 is slidably fitted in the cylinder 10 and is attached to the upper end of the rod 8. A pipe 12 is fitted in the piston or plunger 1v1. The upper end of this pipe slides in the lower end of an auxiliary or service pipe 13 which is fastened in the upper end of the cylinder- 10. Apertures 14 are provided in the walls of this cylinder for admitting liquid from the casing pipe into the cylinder. These 70 apertures may be covered with screens to prevent any dirt from passing inside.

The upper end of the casing pipe 2 hasv a plug 15 with a valve 16. .The ball of the valve is pressedagainst its seat by a lever 17 with a weight 18 which can be adjusted in order tomaintain a desired pressure in the caslng plpe.

The upper end of the service pipe 13 extends into one end of a cylinder 19, which with a piston 20 represents an auxiliary or service pump. The other end of this cylinder is connected by a pipe 21with the casing pipe 2 below the valve 16. The'piston rod 22 is operatively connected with an engine or motor 23 which imparts to the piston 20 a reciprocating motion. A safety valve 24 is provided and a smallintake valve 25 which admits auxiliary liquid into the' cylinder 19. This 90 auxiliary liquid fills the space in the pipes 12 and 13 and the space in the cylinder 10 below the plunger 11. This auxiliary liquid may be the same which vis pumped from the well, or it :may be different, water, oil etc.`

The operation of my pump is as follows.

When the .piston 20 is moved to the left it moves the liquid column in the pipes 13 and 12, filling` the space under the plunger 11 thereby raising same in the auxiliary cylinder 10o* l .is v v oaf-the motor.

' operation of the geological point o 10. The liquid from this cylinder flows into the casing pipe 2 through the apertures 14.

The piston 11 raises also the piston 6 which raises vthe column of` liquid in the pipe 2, filling also the space in cylinder 19 back of the `piston through the pipe`21. When a certain limiting pressure is reached, the check vvalve 16 is forced open against the pressure of the weight 18 admitting the liquid to the upper portion of the p'pe 2 for delivering mt'o storage or shipping tanks.

With the return movement of the piston 20 the liquid column inthe pipes 13 and 12 is the speed of the pum amount of liquid toe pumped, and this is 'the well to its bottom;

drawn upward causing the piston 11 to drop' down under v pressure of the liquid in the pipes 10 and 2. The pipe 12 slides down in the pipe 13, and the rod Y8'pushes the piston 6 down. The valve 5 becomes closed by the pressure of-the li uid, and the piston valve 7 o ens, admitting t e liquid in the space above t e piston, into the casing pipe 2; The preslsurein the pipes 13 and 12 does not decrease as the .amountof liquid forced from the one s ide of the cylinder 19 equals the amount ad mittedinto the other.Y Forthis purpose-the volume displaced byl the piston 20 is made equal the volume displaced bythe piston 11.

there) simplicity `and lowcost of construc- Y tion; large v the well; a

' cause diilicultles m placing the pump 'inthe iston travel or stroke possible in l sence of by-pass pipes reducing the active diameterof the `pump,",which may well or removing it; possibility to regulate in accordance with the easily accomplished by varying the power Such regulation 'renders the pump more eiective from a view, and all the troubles, connected with elastic vibrations of long movin g rods are avoided, there being no mechanicalmoving arts extending from the/to of the poibility o `removing from the well for cleaning the operatjing portion only of the mechanism; a very sibility to use the available rod iliary reciprocating high coeicient of eliciency possible; the postheir parts.

I claim as myinvention a 1.- In anoil well pump, the combination with an oil well in a casing pipe adapted to pump the oil through said casing` pipe, of an auxplunger in a cooperative relation with said pump, a c linder enclosing said plunger and supported inside of said casof said auxiliary pump being pumps and 4 ing pipe, the walls of saidl cylinder forming a clearance within said casing Ap1 e, a plpe extending from said cylinder an attached thereto inside. of Said casing pipe to the top of said well; a liquid lling said pipe and said cylinder, a ump at the top of said well, one side of saidptop pump being connected 'with said bottom pump through vsaid inside casing pipe in a coordlnation with said pump,

a plungerA in said cylinder, a' rod connectingff v said plunger with said pump, a pi e extending from said cylinder to the top o said well, a tube extendin ably fitted in said cylinder vto `conduct .an operatin plun er inside of saidcy inder, said cylinder pipe eing connected with one side of an auxiliary pump at the to of said well, said pipe being fastened to saiffcylnder, the other side connected with said casing pipe, said auxiliary ump being ada ted to alternately. move sald liquid in sai ipes thereby operating said plunger and i said ottom pump. q

Signed at Berlin, inthe county of Brandenburg and State of Prussia, rthis 10th day of June, A. D. 1929.

j' ABRAM A. KAPLAN SKY.

pipe and adapted .liquid under said p lao:

a reciprocating pump at the bottom of from said plunger and slid- 

